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/arch/arm/mach-msm/board-trout-mmc.c

https://github.com/AICP/kernel_google_msm
C | 183 lines | 144 code | 34 blank | 5 comment | 13 complexity | aeb322862244c900f45be8741a02d7a8 MD5 | raw file
  1/* linux/arch/arm/mach-msm/board-trout-mmc.c
  2** Author: Brian Swetland <swetland@google.com>
  3*/
  4#include <linux/gpio.h>
  5#include <linux/kernel.h>
  6#include <linux/init.h>
  7#include <linux/platform_device.h>
  8#include <linux/delay.h>
  9#include <linux/mmc/host.h>
 10#include <linux/mmc/sdio_ids.h>
 11#include <linux/err.h>
 12#include <linux/debugfs.h>
 13
 14#include <asm/io.h>
 15
 16#include <mach/vreg.h>
 17#include <mach/proc_comm.h>
 18#include <mach/mmc.h>
 19
 20#include "devices.h"
 21
 22#include "board-trout.h"
 23
 24#define DEBUG_SDSLOT_VDD 1
 25
 26/* ---- COMMON ---- */
 27static void config_gpio_table(uint32_t *table, int len)
 28{
 29	int n;
 30	unsigned id;
 31	for(n = 0; n < len; n++) {
 32		id = table[n];
 33		msm_proc_comm(PCOM_RPC_GPIO_TLMM_CONFIG_EX, &id, 0);
 34	}
 35}
 36
 37/* ---- SDCARD ---- */
 38
 39static uint32_t sdcard_on_gpio_table[] = {
 40	PCOM_GPIO_CFG(62, 2, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_8MA), /* CLK */
 41	PCOM_GPIO_CFG(63, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_8MA), /* CMD */
 42	PCOM_GPIO_CFG(64, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_8MA), /* DAT3 */
 43	PCOM_GPIO_CFG(65, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_8MA), /* DAT2 */
 44	PCOM_GPIO_CFG(66, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_4MA), /* DAT1 */
 45	PCOM_GPIO_CFG(67, 2, GPIO_OUTPUT, GPIO_PULL_UP, GPIO_4MA), /* DAT0 */
 46};
 47
 48static uint32_t sdcard_off_gpio_table[] = {
 49	PCOM_GPIO_CFG(62, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* CLK */
 50	PCOM_GPIO_CFG(63, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* CMD */
 51	PCOM_GPIO_CFG(64, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* DAT3 */
 52	PCOM_GPIO_CFG(65, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* DAT2 */
 53	PCOM_GPIO_CFG(66, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* DAT1 */
 54	PCOM_GPIO_CFG(67, 0, GPIO_OUTPUT, GPIO_NO_PULL, GPIO_4MA), /* DAT0 */
 55};
 56
 57static uint opt_disable_sdcard;
 58
 59static int __init trout_disablesdcard_setup(char *str)
 60{
 61	int cal = simple_strtol(str, NULL, 0);
 62	
 63	opt_disable_sdcard = cal;
 64	return 1;
 65}
 66
 67__setup("board_trout.disable_sdcard=", trout_disablesdcard_setup);
 68
 69static struct vreg *vreg_sdslot;	/* SD slot power */
 70
 71struct mmc_vdd_xlat {
 72	int mask;
 73	int level;
 74};
 75
 76static struct mmc_vdd_xlat mmc_vdd_table[] = {
 77	{ MMC_VDD_165_195,	1800 },
 78	{ MMC_VDD_20_21,	2050 },
 79	{ MMC_VDD_21_22,	2150 },
 80	{ MMC_VDD_22_23,	2250 },
 81	{ MMC_VDD_23_24,	2350 },
 82	{ MMC_VDD_24_25,	2450 },
 83	{ MMC_VDD_25_26,	2550 },
 84	{ MMC_VDD_26_27,	2650 },
 85	{ MMC_VDD_27_28,	2750 },
 86	{ MMC_VDD_28_29,	2850 },
 87	{ MMC_VDD_29_30,	2950 },
 88};
 89
 90static unsigned int sdslot_vdd = 0xffffffff;
 91static unsigned int sdslot_vreg_enabled;
 92
 93static uint32_t trout_sdslot_switchvdd(struct device *dev, unsigned int vdd)
 94{
 95	int i, rc;
 96
 97	BUG_ON(!vreg_sdslot);
 98
 99	if (vdd == sdslot_vdd)
100		return 0;
101
102	sdslot_vdd = vdd;
103
104	if (vdd == 0) {
105#if DEBUG_SDSLOT_VDD
106		printk("%s: Disabling SD slot power\n", __func__);
107#endif
108		config_gpio_table(sdcard_off_gpio_table,
109				  ARRAY_SIZE(sdcard_off_gpio_table));
110		vreg_disable(vreg_sdslot);
111		sdslot_vreg_enabled = 0;
112		return 0;
113	}
114
115	if (!sdslot_vreg_enabled) {
116		rc = vreg_enable(vreg_sdslot);
117		if (rc) {
118			printk(KERN_ERR "%s: Error enabling vreg (%d)\n",
119			       __func__, rc);
120		}
121		config_gpio_table(sdcard_on_gpio_table,
122				  ARRAY_SIZE(sdcard_on_gpio_table));
123		sdslot_vreg_enabled = 1;
124	}
125
126	for (i = 0; i < ARRAY_SIZE(mmc_vdd_table); i++) {
127		if (mmc_vdd_table[i].mask == (1 << vdd)) {
128#if DEBUG_SDSLOT_VDD
129			printk("%s: Setting level to %u\n",
130			        __func__, mmc_vdd_table[i].level);
131#endif
132			rc = vreg_set_level(vreg_sdslot,
133					    mmc_vdd_table[i].level);
134			if (rc) {
135				printk(KERN_ERR
136				       "%s: Error setting vreg level (%d)\n",
137				       __func__, rc);
138			}
139			return 0;
140		}
141	}
142
143	printk(KERN_ERR "%s: Invalid VDD %d specified\n", __func__, vdd);
144	return 0;
145}
146
147static unsigned int trout_sdslot_status(struct device *dev)
148{
149	unsigned int status;
150
151	status = (unsigned int) gpio_get_value(TROUT_GPIO_SDMC_CD_N);
152	return (!status);
153}
154
155#define TROUT_MMC_VDD	MMC_VDD_165_195 | MMC_VDD_20_21 | MMC_VDD_21_22 \
156			| MMC_VDD_22_23 | MMC_VDD_23_24 | MMC_VDD_24_25 \
157			| MMC_VDD_25_26 | MMC_VDD_26_27 | MMC_VDD_27_28 \
158			| MMC_VDD_28_29 | MMC_VDD_29_30
159
160static struct msm_mmc_platform_data trout_sdslot_data = {
161	.ocr_mask	= TROUT_MMC_VDD,
162	.status		= trout_sdslot_status,
163	.translate_vdd	= trout_sdslot_switchvdd,
164};
165
166int __init trout_init_mmc(unsigned int sys_rev)
167{
168	sdslot_vreg_enabled = 0;
169
170	vreg_sdslot = vreg_get(0, "gp6");
171	if (IS_ERR(vreg_sdslot))
172		return PTR_ERR(vreg_sdslot);
173
174	irq_set_irq_wake(TROUT_GPIO_TO_INT(TROUT_GPIO_SDMC_CD_N), 1);
175
176	if (!opt_disable_sdcard)
177		msm_add_sdcc(2, &trout_sdslot_data,
178			     TROUT_GPIO_TO_INT(TROUT_GPIO_SDMC_CD_N), 0);
179	else
180		printk(KERN_INFO "trout: SD-Card interface disabled\n");
181	return 0;
182}
183